Shock-absorbing device



April 19, 1927. 1,625,570

B. F. $HIELDS ET AL SHOCK ABSORBING DEVICE v Filed'May15, 1923 3 Sheets-Sheet 1 INVENTOR Benjamin 1". Shields Char/es G. Qromtie George A [Wade/l BY a.

ATTORNEY April 19 1927. 1,625,570

- B. F. SHIELDS ET AL SHOCK ABSORBING DEVICE Filed May 15. 1923 s Sheets-Sheet 5 v m /8 I? M 20 mi! ,1 --rl i r- W1 my. 48

my. 1e

' INVENTORS Benjamin 7: Shields Gkar/es G. Crumb/e Georye A. h/lhae/l Patented Apr. 19, 1927.

UNITED STATES PATENT @FFICE.

IBENJAMINF. SHIELDS, CHARLES G. CROMBIEiAND GEORGE A. WINDELL, OE- SEATTLE,

WASHINGTON.

SHOCK-ABSORBING DEVICE.

Application filed May 15,

Our invention relates to the art of shock absorbing devices for disposition between the axle and the frame of a spring supported vehicle. More particularly, our invention relates to a device for absorbing excess deflection and rebound strains of the springs of vehicles. 7

e will set forth our invention as applied to motor vehicles for purposes of clearness and preciseness; however, it is not to be presumed that our invention is limited to any such special application, but is applicable to all instances presenting like problems.

Automobiles are ordinarily provided with springs which are designed and constructed to work efficiently and smoothly when. the said automobiles have a normal load and are operated at normal running speeds. .When the springs are depressed or deflected beyond this normal sphere, as when an obstruetion is encountered, they will rebound beyond their normal position. Naturally, a properly designed shocii absorber should operate only to resist excessive compression and excessive rebound action, and should not interfere in any wise with the action of the springs in the normal sphere of said spring action. A serious objection obtains to shock absorbers of present design in use in that they operate to some extent at all times, i. e., the action of said shock absorbers interferes with the action of the springs, even in the sphere of their normal action. A primary object of our invention is to provide a shock absorbing device, which will not interfere with the spring action within said normal sphere, but will operate only to resist eX- cessive com aression of the springs and excessive rebound action of the springs.

There have been c esigned shock absorbing devices which do take into account said normal sphere of action of the springs, i. e., which permit said springs to worl; unhampered under normal load and under normal conditions. However, a serious objection does obtain to these devices in that when they do commence action, their full braking effect is called into operation at the very beginning of their resisting the excessive deflection andr-ebound action of the springs. Obviously, such braking action causes a shock to be imparted at the time of the commencement of the braking action. A primary object of our invention is to provide a shock absorbing device which ias a zone 1923. serial No. 639,083.

ofinaction, and which provides-for a'braking effect to be applied gradually when the limits of the neutral sphereare exceeded, whether the same be upon compression or upon rebound.

From the above, it is manifest that some of the devices of the prior art tend to exert a retarding action as soon as any movementof the vehicle spring from its normal position begins, and continues to retard the said spring action with increasing force as the movement increases. thereby having the effect of adding to the stiffness of the spring and causing the vehicle body to ride less easily and smoothly. usually is arranged to absorb the recoil or rebound of the vehicle body after a sudden compression of tl e spring. Another type of shock. absorbing device, known as the snubber, freely permits the spring to become compressed, but catches it at the point of greatest deflection and exerts a retarding effect-throughout the entire recoil movement of the spring,thus failing to reinforce the spring when it is deflected more than the normal amount, and slowing up the action of the spring by exerting a retarding effect throughoutthe entire recoilimovement. Be it particularly noted that at the very time when the greatest demand is made upon this type of shock absorber, the spring effort is That type ofdevice the weakest. As stated, a primary object of our invention is to provide a shock absorber which will operate in both directions, i. e., compressing and recoiling,and which will meet the increasing, force with a gradually increasing resisting or braking eifort.

Another-very important practical requirement for a shock absorbing device is that it be adapted for use on a wide range of sizes of cars. Obviously, the extra cost of marketing accessories, which involve a large number of different sizes, is often sufficient to prevent their being introduced to the trade. The extra capital, which must be employed for stocking with the various sizes, introduces a severe, and often prohibitive, handicap from the manufacturing and selling point of View. A. primary object of our invention is to provide a. shock absorbing device characterized by its adaptability for use on a wide range of different sizes of cars.

Correlated with the above is that an accessory of the nature of a shock absorber should be such that there is no right and left in the flangeof the rotary member 22 and a. bearing 46 in the ear 24'of said hub 23. This cam pin hasthe curved parts 47 and the flat parts 48. The cam pin is preferably provided'with' a segmental gear 49,

(see Fig. 1), disposed to intermesli with gear 39. The hub 23 is provided with lubricating ports 50, tirough which lubricating material may pass from the recess'25 to the axle 19. I

In the recess 25 may be LllSPOfStl-tWO segmental brake shoes 51.. Each shoe is pref erably provided with a bevelled end portion 52 disposed. to bear against the conical end portion 41 of the adjusting bolt 40. Also each brake shoe is provided with a hearing 53 to engage cam pin 43. This bear ing is preferably provided through the medium of a spring 54, which is preferably releasably mounted'in a. slot 55 of the brake shoe. Said slot 55 is preferably disposed in a plane which forms an acute angle with the radius of the brake shoe bearing face 56. This spring 54 has a curved end portion 53 which forms the bearing. with the cam pin 43. The full width of the recess 25 is made available for the brake shoes 51, by providing. said shoes with offset portions 57 and 58, which permit the cars 24 of the hub to protrude thereacross. The bearing face 56 is preferably provided with transverse grooves 59, said grooves preferably coniinu-nicating with the recess :25 by means of ports 60. Twosuch segmental brake shoes 51' are preferably provided and oppositely disposed to each other.

The mode of operation of a shock absorbing device embodying our invention is as follows:

e will assume that the vehicle wheel has met with an obstruct-ion, which has caused the spring 61 of the vehicle to be compressed. This compression moves the rod 28 upwardly, which in turn actuatcs arm 26 upwardly, which causes rotary member 22 to rotate counter-clockwise, i. e., the hub 23 of the rotary member is caused to revolve through an arc upon the axle 19 of the mounting member 17. Since gear 39 is fixedly mounted upon the axle 19 ofsaid mounting member 17, said gear actuates segmental gear 49 which causes the cam pin 43 to revolve against the spring 54 of the brake shoes. The cam pin in inactive position is adjusted with its fiat part 48 against the spring 54,

.so that rotation of said pin through a small arc does not result in actuating the brake shoes 51 against the drum 18 of the mounting member 17. Inshort, the vehicle spring 61 is permitted to operate through a certain sphere without any interference by the shock absorber embodying our invention. This sphere of normal action of the spring for small vibrations of the same is diagrammatically represented as occurring through wider diameter are caused to engage the bearing end portions 53 of the springs 54, then the brake shoe is actuated against the brake drum l8. Manifestly, this force is gradual, so that no sudden shock is felt at 'the commencement of the operation of the shock absorber. This force is gradually increased inproportion as the cam pin 43 is caused to rotate through a larger are until the braking operation of the brake shoes is applied forcibly to the drum. The segment 63 of Fig. 16 diagraminatically represents this degree of displacement. As the spring rebounds from the compression, manifestly the cam pin 43 is positively returned to its normal position, and if the vibration is sufficiently great to cause the cam pin to rotate through a sufficientdegree of are, then the braking operation automatically begins again for the segment 63 below the horizonal line 64. Hence, it follows-that the operation of a device embodying our invention is such that it does not interfere with the etlicient and smooth operating of the vehicle spring within such sphere as said spring may be designed to operate freely, but so soon as the deflection, either by con'ipression orrebound action, goes beyond this-normal sphere otact-ion of the spring, then our device is designed to apply a gradually increasing bralring effort, so that said spring is re-enfo cod and in that sphere only of its action for which it was not designed to work smoothly.

Also, be it noted that the parts of the device embodying our invention are positively returned to their normal inactiveposition, so that they are ready to perform their duty upon meeting the next obstruction.

Also, be it particularly noted that the mechanism for achieving the gradually increasing bralring effort is of a very simple nature and construction, so that there is nothing to get out of order, and its operation is in amanner designed to employ parts capable of long wearing, so that the device does not'need repairing and attention for adjustment. All parts are of metal, and, therefore, there is no brake lining to be supplied periodically, or any flexible connector to be stretched and to require adjustment as to its length.

There are five adjustments possible in the device embodying our invention: first, by means of the partial segmental gear 49; second, the threaded middle member 32 of rod28; third, the adjusting bolt 40; fourth, a spring 54 of stronger or stiffer material; and fifth, the change in the fulcrum' point 65. These adjustments will be considered seriatim.

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Different makes of automobiles have springs ariously disposed with respect to the frame. The position of the device on the ear may be adj isted to the requirements o t diti'erent malies of cars, or other requirements as respeets the trout and rear end of the car, by means oi the segmental gear it), without disassembling; the mechanism. This may be done oy turning the segmental. gear to the point where it is out of engagement with the air St). 'thereupon, the rotary member in may be moved to sueh position as u'lay be desired, and the segmental gear ill again eaused to engage the gear i 'll, and the rotary member 313 revolved until it, assumes the desired position, with the ram pin +1? in neutral position as respeet's the hearing end. portions ii-l oi' the swing M.

The threaded middle membmi 312 permits ot the ltHQjt-lwtllng ot the rod 28 and the turning ol. its eonneei'ingg; parts to the desired position as respects the nuurhine, so that: this serves as a second adjustment.

A wide range oi? ears may be zztftfitlllinn dated by one size ol a device embodyingour invention, as itis only neressi ry to inerease the :l'oree with which the spri; bear upon the tlat parts iii of the am pin -4 This :neomplished by means oli the a ljusting bolt it), which upon being serewed in engages by its eonieal end portion -l-l the bevelled portions In of the brake, shoes fit, and causes them to move tU Hll't, that is, they are caused to bear more terribly upon the ram pin. -13 through the s n-inns -1. Thus, the dili'erent strengths ot springs of a wide 'ang'e o't ears may be accommodated and the required degree ot braking ellort supplied to a. nieety, with all ariations due to dil'tierent makes, and even individual springs of the. same make, being taken into eonside'ation.

For exeeptional loads and exee uionally heavy springs, a iurthe' adjustment is possible by supplying spring 51': ot? stronger or stiti'er material. However, for very exceptional loads a larger sized absorber would be preferable, so that a larger braking area also may be supplied.

For very light springs, the :t'ulerum point tui may he .readilyt ground back so that springs 5+: become, so tliar as their ell'eet is concerned, more flexible.

The recess is preferably titled with lubri rating" material by removing the grease plug (36. Obviously, the ilrn'eing out and in (it the. hr: lie shoes will create a suction which will operate to draw in the lubrieant througzjh the ports (it) to the grooves 5'39, and as rotary movement develops between the brake shoe .31 and the drum 18, this lubriaint; will l'ad its way me all parts of the inside oi the drum 18, thereby providing for sutlieient lubricant to prevent disagreeable squ aking sounds. Also, the mass ot lubricant enelosed tends to deaden any rattle which might develop. hloreover, ports permit this lubricant to be supplied to the axle 1.9. Also, titling the recess 25 with lubrieant eoope rates in preventing disagreeable iltltile of the parts within said recess. The l'rat spring :i-l: being adjusted to bear with a sutiioient pressure upon the tlat face 48 ot the am pin it, also prevents disagreeable r: ttle. The aetual exnerienee has proven the ettieieney and the absence of all tflisagreeable 'attle with this device, as well as its du ability.

Obviously, ehanges may be made in the term. dimensions and arrangement; of the parts ot' our invention. without departing: train the urineiple, thereof, the above setting :i'orth only a preterred form of embodinlent.

li e elain1:-

t. it shoelr :bsorlna? embodying a mount ingg; member; a rotary member operatively disposed in said mounting member; a. brake shoe operatively mounted heween said haunting and said rotary members; a eam Jill whieh aetuates said b 'ake shoe, said 1 writing; and rotary members :liorminn; a i and eompletely enclosing said shoe in; gear means lixedly mounted on id (llttt pin: and gear in .ttllS, intermeshiup, with said pin gear means, upon and borne by said mounting member, whereby relative movement heweeu said miuminy, and rotary members may be imparted to said cam pin.

it sheet; :bsorbt-zr en'ibodyiaea mount:- ing member having a drum and axle formed integrally therewith; a rotz'iry member havinn; a hub to med integrally therewith, operatively disposed on said axle of said mounting; member; a brake shoe operatively mounted between said mounting and said rotary members; a cam pin which actuates said brake oe, said mounting and rotary memb forn'iiirga housing and completely enclosing said shoe and pin; gea means fixedly mounted on said ram pin; and gear means, intermeshing with said pin gear means, lixedly mounted upon and borne by said mounting member, whereby relative movement between said mounting and rotary members may be imparted to said cam pin 3. it shorlc. absorber embodying a mount;- ing member having a drum and axle formed integrally therewith; a rotary member havinna hub 'lormed integrally therewith, operatively disposed on said axle of said mounting member, said hub having an ear on one side thereo'l a brake shoe operatively mounted between said mountingand said rotary members; a ram pin 'arried as respeets one end by said rotary member and the other end bearing in said hub ear, said pin :u-tuatin said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and pin;

fixedly mounted gear means fixedly mounted on said cam pin; and gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between said mounting and rotarymembers may be imparted to said cam pin.

4. A shock absorber embodying a mount ing member; a rotary member operatively disposed in said mounting member; a brake shoe operatively mounted between said mounting and said rotary members; a campin which actuates said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and pin; segmental gear means fixedly mounted on said cam pin, whereby adjustment of the shock absorber to the desired position on the vehicle may be made; and gear means, intermeshing with said segmental gear, fixedly mounted upon and borne by said mounting. member, whereby relative movement between the said mounting and rotary members may be imparted to said cam pin.

5. A shock absorber embodying a 1nounting member having a drum and axle formed integrally therewith; a rotary member having a hub formed integrally therewith, operatively disposed on said axle of said mounting member; a brake shoe operatively mounted between said mounting and said rotary members; a cam pin which actuates said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and pin; segmental gear means fixedly mounted on said cam pin, whereby adjustment of the shock absorber to the desired position on the vehicle'may be made; and gear means, intermeshing with said-segmental gear, fixedly mounted upon and borne by said mounting member, whereby relative movement betwen the said mounting and rotary members may be imparted to said cam pin 7 6. A shock absorber embodying a mounting member having a drum and axle formed integrally therewith; a rotary member havinga .hub formed integrally therewith, operat-ively disposed on said axle of said mounting member, said hub having an ear on one side thereof; a brake shoe operatively mounted between said mounting and said rotary members; a' cam pin carried as respects one end by said rotary member and the other end bearing in said hub ear, said pin actuating said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and pin; segmental gear means fixedly mounted on said cam pin, whereby adjustment of the shock absorber to the desired position on the vehicle may be made; and gear means, intermeshing with said segmental gear, fixedly mounted upon and borne by said mounting member, whereby relative movement between the said mounting and rotary members may be imparted to said cam pin.

7, A shock absorber embodying a mounting member; a rotary member operatively disposed on said mounting member; two segmental brake shoes oppositely disposed between said moimting and said rotary members; a cam pin which actuates said brake shoes, said mounting and rotary mem bers forming a housing and completely enclosing said shoes and pin; gear means fixedly mounted on said cam pin; and gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between said mounting and rotary members may be imparted to said cam pin.

8. A- shock absorber embodying a mounting member having a drum and axle :tormed integrally therewith; a rotary member having a hub formed integrally therewith, operatively disposed on said axle of said mounting member; two segmental brake shoes oppositely disposed between said mounting and said rotary members; a cam pin which actuates said brake shoes,-said mounting and rotary members forming a housing and completely enclosing said shoes and pin; gear means fixedly mounted on said cam pin; gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between the said mounting and rotary members may be imparted to said cam pin.

9. A shock absorber embodying a mounting member having a drum and axle formed integrally therewith; a rotary member having a hub formed integrally therewith, operatively disposed 'on said axle of said mounting member, said hub having an ear on one side thereof; two segmental brake shoes oppositely disposed between said mounting and rotary members; a cam pin which actuates said brake shoes, said mounting and rotary members forming a housing and completely enclosing said shoes and pin; gear means fixedly mounted on said cam pin; gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between the said mounting and rotary members may be imparted to said cam pin.

10. A shock absorber embodying a mounting member; a rotary member operatively disposed in said mounting member; a brake shoe operatively mounted between said mounting and said rotary members; an adjusting pin operatively disposed with respect to said brake shoe; a cam pin which actuates said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and cam pin;

gear means fixedly mounted on said cam pin; and gear means, intern'ieahing with said pin gear means, fixedly mounted upon and borne by Said mounting member, whereby relative movement between Eitltl mounting: and rotary members may be imparted to said cam pin.

ll. .it sheet; absorber euthtulyine a mountiue member baring; a drum and axle termed integrally therewith; a rotary member having a hub itormed integrally tluirewith. operatively disposed on said axle oi. said mounting member: a hin e shoe o ieratively mounted between said mounting; and said rotary metnber;-;; an adjusting! oin operatirely disposed with respect to said brake shoe: a earn pin which aetnatea said brake shot. said mounting and rotary membera tormine a housing and completely enelosing said shoe and cam pin; gear means lircedly mounted on said eam pin; and eear means intermeehing: with said pin gear means. llXttllf mounte: upon and borne by said mounting member; whereby relative movement between said mounting and rotary member may be imparted to said rain pin.

152. Jr sheet; abeorber mubmlyingg; a mounting: inen'iber having a drum and axle termed integrally therewith; a rotary member havinn a hub formed integrally therewith, operatively disposed on said axle o said mounting); member. said hub having an our on one Side thereof; a brake shoe operativeiv mounted between said titt)ltlltlil f and said rotary members: an adjusting pin operatively disposed with rrsaport to said hralie shoe; a ram pin carried as respects one end by said rotary member and the other end bearing; in said hub ear, said eam pin attuatine; said bralre ahoe, said mounting and rotary members forming: a housing: and com liletely enelonine raid shoe and ram pin: {rear means lixedlv mounted on said earn pin; and gear means, .lltttttlttt-'liltl with eaid rain pin gear uleane, linedly mounted upon and borne by aaid mounting member whereby relative movement between said mountiiu and rotary nunnbera may he imparted to said cam pin.

.137 it ahoeli: absorber embodying; a mounting member; a rotary member operativelv disposed in said mounting member: a brake Shoe o ieratively mounted between. raid mounting and said rotary annular-:5; an udjustingr pin operatirely dispoz-ied with respect to raid brake rhoo; a earn pin whit-h. aetuatee said brake shotn eaitt mouutinn and rotary members ermine a housing and eompletely enclosing said oboe, and pin; seek mental near 1119:1115 tixedlv mounted on Said can] pin wherebv adjustment of the :shoeh absorber to the desired poeition on the vehiele may be nnule; and {tear means internieshing with said segmental gear, .tixedly mounted upon and borne by said mounting member whereby relative movement be tween the said mounting; and rotary members may be imparted to said cam pin.

1-.l-. A sheet; absorber embodying a1nountine; member having a. drum and axle lformed integrally therewith; a rotary member having a hub :lTormod integrally therewith, oporatively disposed on said axle of said mourning member; a brake shoe operatively nnntntod between said mounting and said rotary members; an adjusting pin opera-.

lively disposed with respect to said brake. shoe; a cam pin which aetuates said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and earn pin; egmental great means fixedly mounted on said can't pin, whereby adjustment of the shock absorber to the desired position on the vehicle may be made; and gear meanei intermeshiug with. said segmental gear, fixedly mounted upon and borne by aid mounting member whereby relative movement between the said mounting and rotary ll'ttEittbOl'S may be imparted to said earn pin.

A shook absorber embodying amounting member having a drum and axle formed integrally therewith; a rotary member having a hub 'l'ormed integrally therewith, operatively disposed on said axle of said mounting; member, said hub having an our on one side thcnreo'li; a brake shoe ope'atively mounted between said mounting and said rotary membt-ae; an adjusting pin operativoly disposed with respect to said brake shoe; a cam pin carried as respects one end by said rota r v u'iember and the other end bearing in said huh our, said eant pin actuating said. brake shoe, Said mounting and rotary mom-- hers forming a housing; and completely on-- eloaine said shoe and cant pin; segmental. u'ear means fixedly mounted on said oaln pin, whereby :HljttFttl'lGliti ot the shock absorber to the desired poaition on the vehicle may be made; and gear in ants, interlneshing with said segmental. e ear. fixedly mounted upon and borne by said mounting member, where by relative movement; between the said nu'iuntine' and rotary members may be imparted to said ram pin.

16. it shock absorber emlualyinga mounting member; a rotary member operatively disposed on said mounting member; two segmental hralze shoes oppositely disposed bi tween said mounting and said rotary uien1- here; an adjustirnr pin operatively disposed with respect to said brake shoes; a cam pin which aetuates said brake shoes, said mountino; and rotary members itorn'iing a housing and completely enclosing said shoes and eani pin: gear means fixedly mounted. on said eam pin 5 and gear means, interineshing with said pin near means fixedly mounted upon and borne by said mounting member, whereby relative movement between said mounting and rotary members may be imparted to said cam pin.

17. A shock absorber embodying a mounting member having a drum and axle formed integrally therewith; a rotary member having a hub formed integrally therewith, operatively disposed on said axle of said mounting member; two segmental bralxe shoes oppositely disposed between said mounting and said rotary members; an adjusting pin operatively disposed with respect to said brake shoes; a cam pin which actuates said brake shoes, said mounting and rotary members forming a housing and completely enclosing said shoes and cam pin; gear means fixedly mounted on said ca m pm; gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between the said mounting and rotary members may be imparted to said cam 7 p 18. A shock absorber embodying a mounting member having a drum and axle formed integrally therewith; a rotary member hav ing a hub formed integrally therewith, operatively disposed on said axle of said mounting member, said hub having an ear on one side thereof; two segmental bralre shoes oppositely disposed between said mounting and rotary members; an adjusting pin operatively disposed with respect to sa d brake shoes, a cam pin which actuates said brake shoes, said mounting and rotary members forming a housing and completely enclosin said shoes and cam pin; gear means fixedly mounted on said cam pin; gear means, intermeshing with said pin gear means, fixedly mounted upon and borne by said mounting member, whereby relative movement between the said mounting and rotary members may be imparted to said cam'pin.

19. A shock absorber embodying amounting member; a rotary member operatively disposed in said mounting member; a brake shoe operatively mounted between said mounting and said rotary members; a cam pin which actuates said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and cam pin; means whereby relative movement between the said mounting and rotary members may be imparted to said cam pin; a clamping cover bearing a gear thereon; and a bolt disposed through said clamping cover and threadedly disposed in said mounting member, whereby all of the said parts are held operatively disposed.

20. A shock absorber embodying a mounting member; a rotary member operatively disposed in said mounting member; a brake shoe operatively mounted between said mounting and said rotary members, said brake shoe having a leaf spring disposed in a plane which forms an acute angle with the radius of said brake shoe; a cam pin which bears against said leaf spring of said brake shoe, said mounting and rotary members forming a housing and completely enclosing said shoe and pin; and means whereby relative movement between the said mounting and rotary members may be imparted to said cam pin.

21. In combination with a shock absorber having a cam pin, a brake shoe carrying a leaf spring thereon, said spring forming the bearing means between said cam pin and said brake shoe, whereby objectionable rattle is eliminated and a gradually increasing braking effort is imparted to the brake shoe.

22. A shock absorber en'ibodying a mounting member having a drum and axle formed integrally therewith; a rotary member having a hub formed integrally therewith, operatively disposed on said axle of said mounting member, said hub having an ear thereon; two segmental brake shoes oppositely disposed between said mounting and said rotary members, said brake shoes having holes radially disposed, whereby lubricating material may pass therethrough; an adjusting bolt having a conical end portion carried by said rotary member; a cam pin car.- ried by said rotary member and having an end bearing in said hub car, said pin actuattary members forming a housing and completely enclosing said shoes and pin; segmental gear means fixedly mounted on said cam pin; and gear means, intermeshing with said pin gear means fixedly mounted upon and borne by said mounting member, whereby relative movement between said mounting and rotary members may be imparted to aid cam pin.

23. In combination with a shock absorber having a cam pin, a brake shoe carrying a leaf spring thereon, said spring forming the bearing means, between said cam pin and said brake shoe, whereby the braking eii'ort is adjusted to check the rebound at the springs maximum compression and a wave motion imparted thereby to the vehicle.

In witness whereof, we hereunto subscribe our names this 8 day of May, A. D., 1923.

BENJAMIN F. SHIELDS. CHARLES G. GROMBIE. GEORGE A. VVINDELL.

mg said brake shoes, said mounting and ro-, 

